listview getChildAt() Return null

This produces null:

 TextView textView = (TextView) listView.getChildAt(0);
 Log.i("item", textView.getText().toString());

And this does not:

    TextView textView = (TextView) listView.getAdapter().getView(0, null, listView);
    Log.i("item", textView.getText().toString());

This example used android.R.layout.simple_list_item_1 so keep in mind that TextView is root view in simple_list_item_1.